Scale hb_font for cgFont with freetype face scale metrics
Scale hb_font for cgFont with freetype face scale metrics

- To get the apt advance and other glyph properties for apt font size, scale the harfbuzz font
created from coretext context with freetype face (created from coretext raw data).

- Also apply apt conversion for CGFont's height, ascent and descent

hjanetzek/alfons,hjanetzek/alfons